Methods (cf. Experimental Section): A involved use of the THP ether of the alkynol; B involved use of the (l-ethoxy-PR:: propargyl alcohol, MB= 2-methyl-3-butyn-2-01, B= 3-butyn- 1-01, and P= 4-pentyn-2-01. ethyl) ether of the alkynol; C involved in situ generation of the ...